public void Identify_DetectsCorrectColorType(string imagePath, PbmColorType expectedColorType)
{
var testFile = TestFile.Create(imagePath);
using var stream = new MemoryStream(testFile.Bytes, false);
IImageInfo imageInfo = Image.Identify(stream);
Assert.NotNull(imageInfo);
PbmMetadata bitmapMetadata = imageInfo.Metadata.GetPbmMetadata();
Assert.NotNull(bitmapMetadata);
Assert.Equal(expectedColorType, bitmapMetadata.ColorType);
}
private void DeduceOptions <TPixel>(Image <TPixel> image)
where TPixel : unmanaged, IPixel <TPixel>
{
this.configuration = image.GetConfiguration();
PbmMetadata metadata = image.Metadata.GetPbmMetadata();
this.encoding = this.options.Encoding ?? metadata.Encoding;
this.colorType = this.options.ColorType ?? metadata.ColorType;
if (this.colorType != PbmColorType.BlackAndWhite)
{
this.componentType = this.options.ComponentType ?? metadata.ComponentType;
}
else
{
this.componentType = PbmComponentType.Bit;
}
}
public void ImageLoadCanDecode(string imagePath, PbmColorType expectedColorType, PbmComponentType expectedComponentType)
{
// Arrange
var testFile = TestFile.Create(imagePath);
using var stream = new MemoryStream(testFile.Bytes, false);
// Act
using var image = Image.Load(stream);
// Assert
Assert.NotNull(image);
PbmMetadata metadata = image.Metadata.GetPbmMetadata();
Assert.NotNull(metadata);
Assert.Equal(expectedColorType, metadata.ColorType);
Assert.Equal(expectedComponentType, metadata.ComponentType);
}
/// <summary>
/// Decode pixels into the PBM plain encoding.
/// </summary>
/// <typeparam name="TPixel">The type of input pixel.</typeparam>
/// <param name="configuration">The configuration.</param>
/// <param name="stream">The bytestream to write to.</param>
/// <param name="image">The input image.</param>
/// <param name="colorType">The ColorType to use.</param>
/// <param name="componentType">Data type of the pixles components.</param>
public static void WritePixels <TPixel>(Configuration configuration, Stream stream, ImageFrame <TPixel> image, PbmColorType colorType, PbmComponentType componentType)
where TPixel : unmanaged, IPixel <TPixel>
{
if (colorType == PbmColorType.Grayscale)
{
if (componentType == PbmComponentType.Byte)
{
WriteGrayscale(configuration, stream, image);
}
else
{
WriteWideGrayscale(configuration, stream, image);
}
}
else if (colorType == PbmColorType.Rgb)
{
if (componentType == PbmComponentType.Byte)
{
WriteRgb(configuration, stream, image);
}
else
{
WriteWideRgb(configuration, stream, image);
}
}
else
{
WriteBlackAndWhite(configuration, stream, image);
}
// Write EOF indicator, as some encoders expect it.
stream.WriteByte(Space);
}
